#!/bin/sh

################################################################################
##                                                                            ##
## Copyright (c) International Business Machines  Corp., 2006                 ##
##                                                                            ##
## This program is free software;  you can redistribute it and#or modify      ##
## it under the terms of the GNU General Public License as published by       ##
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## This program is distributed in the hope that it will be useful, but        ##
## WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY ##
## or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License   ##
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################################################################################
#
# File:
#   route4-change-if
#
# Description:
#   Verify the kernel is not crashed when the interface of an IPv4 route is
#   changed frequently
#    test01 - by route command
#    test02 - by ip command
#
# Setup:
#   See ltp-yyyymmdd/testcases/network/stress/README
#
# Author:
#   Mitsuru Chinen <mitch@jp.ibm.com>
#
# History:
#	Mar 17 2006 - Created (Mitsuru Chinen)
#
#-----------------------------------------------------------------------
# Uncomment line below for debug output.
#trace_logic=${trace_logic:-"set -x"}
$trace_logic

# Make sure the value of LTPROOT
LTPROOT=${LTPROOT:-`(cd ../../../../ ; pwd)`}
export LTPROOT

# Total number of the test case
TST_TOTAL=2
export TST_TOTAL

# Default of the test case ID and the test case count
TCID=route4-change-if
TST_COUNT=0
export TCID
export TST_COUNT

# Check the environmanet variable
. check_envval || exit $TST_TOTAL

# The number of times where route is changed
NS_TIMES=${NS_TIMES:-10000}

# The first 2 ocnted of the Network portion of the gateway address
IPV4_NETWORK_PRE=${IPV4_NETWORK_PRE:-"10.0"}

# Netmask of for the gateway
IPV4_NETMASK_NUM=24

# Host portion of the IPv4 address
LHOST_IPV4_HOST=${LHOST_IPV4_HOST:-"2"}	# src
RHOST_IPV4_HOST=${RHOST_IPV4_HOST:-"1"}	# gateway

# The destination network
DST_NETWORK="10.10.0"	# destination network would be 10.10.0.0/24
DST_HOST="5"
DST_PORT="7"


#-----------------------------------------------------------------------
#
# NAME:
#   do_setup
#
# DESCRIPTION:
#   Make a IPv4 connectivity
#
# SET VALUES:
#   rhost_ipv4addr	- IPv4 Address of the remote host
#   lhost_ifname	- Interface name of the local host
#   rhost_ifname	- Interface name of the remote host
#
#-----------------------------------------------------------------------
do_setup()
{
    TCID=route4-change-if
    TST_COUNT=0

    # Get the number of the test links
    link_total=`echo $LHOST_HWADDRS | wc -w`
    rhost_link_total=`echo $RHOST_HWADDRS | wc -w`
    if [ $link_total -ne $rhost_link_total ]; then
	tst_resm TBROK "The number of element in LHOST_HWADDRS differs from RHOST_HWADDRS"
	exit $TST_TOTAL
    fi
    if [ $link_total -lt 2 ]; then
	tst_resm TBROK "This test case requires plural Test Links"
	exit $TST_TOTAL
    fi

    lhost_ifname_array=""
    rhost_ifname_array=""
    link_num=0
    while [ $link_num -lt $link_total ]; do
	# Get the Interface names of the local host
	lhost_ifname=`get_ifname lhost ${link_num}`
	if [ $? -ne 0 ]; then
	    tst_resm TBROK "Failed to get the interface name at the local host"
	    exit $TST_TOTAL
	fi
	lhost_ifname_array="$lhost_ifname_array $lhost_ifname"

	# Get the Interface names of the remote host
	rhost_ifname=`get_ifname rhost ${link_num}`
	if [ $? -ne 0 ]; then
	    tst_resm TBROK "Failed to get the interface name at the remote host"
	    exit $TST_TOTAL
	fi
	rhost_ifname_array="$rhost_ifname_array $rhost_ifname"

	# Initialize the interfaces of the remote host
	initialize_if rhost ${link_num}

	# Set IPv4 address to the interface of the remote host
	set_ipv4addr rhost ${link_num} "${IPV4_NETWORK_PRE}.${link_num}" ${RHOST_IPV4_HOST}
	if [ $? -ne 0 ]; then
	    tst_resm TBROK "Failed to assign IP address to the interface $rhost_ifname at the remote host"
	    exit $TST_TOTAL
	fi

	link_num=`expr $link_num + 1`
    done
}




#-----------------------------------------------------------------------
#
# NAME:
#   do_cleanup
#
# DESCRIPTION:
#   Recover the tested interfaces
#
#-----------------------------------------------------------------------
do_cleanup()
{
    # Make sure to kill the udp datagram sender
    killall -SIGHUP ns-udpsender >/dev/null 2>&1

    # Initialize the interfaces
    link_num=0
    while [ $link_num -lt $link_total ]; do
	initialize_if lhost ${link_num}
	initialize_if rhost ${link_num}
	link_num=`expr $link_num + 1`
    done
}


#-----------------------------------------------------------------------
#
# FUNCTION:
#   test_body
#
# DESCRIPTION:
#   main code of the test
#
# Arguments:
#   $1: define the test type
#       1 - route command case
#       2 - ip command case
#
#-----------------------------------------------------------------------
test_body()
{
    test_type=$1

    TCID=route4-change-if0${test_type}
    TST_COUNT=$test_type

    case $test_type in
	1)
	test_command="route"
	;;
	2)
	test_command="ip"
	;;
	*)
	tst_resm TBROK "unspecified case"
	return 1
	;;
    esac

    tst_resm TINFO "Verify the kernel is not crashed when the interface of an IPv4 route is changed frequently by $test_command command in $NS_TIMES times"

    link_num=0
    while [ $link_num -lt $link_total ]; do
	# Initialize the interface of the local host
	initialize_if lhost ${link_num}

	# Assign IPv4 address to the interface of the local host
	set_ipv4addr lhost ${link_num} "${IPV4_NETWORK_PRE}.${link_num}" ${LHOST_IPV4_HOST}
	if [ $? -ne 0 ]; then
	    tst_resm TBROK "Failed to assign an IPv4 address at the local host"
	    return 1
	fi

	# Check the connectivity to the gateway
	field=`expr $link_num + 1`
	lhost_ifname=`echo $lhost_ifname_array | cut -d ' ' -f $field`
	check_icmpv4_connectivity $lhost_ifname "${IPV4_NETWORK_PRE}.${link_num}.${LHOST_IPV4_HOST}"
	if [ $? -ne 0 ]; then
	    tst_resm TBROK "Test Link $link_num is somthing wrong."
	    return 1
	fi
	link_num=`expr $link_num + 1`
    done

    # Set the variables regarding the destination host
    dst_addr=${DST_NETWORK}.${DST_HOST}
    dst_network=${DST_NETWORK}.0

    # Set the first route
    link_num=0
    field=`expr $link_num + 1`
    lhost_ifname=`echo $lhost_ifname_array | cut -d ' ' -f $field`
    gateway="${IPV4_NETWORK_PRE}.${link_num}.${RHOST_IPV4_HOST}"
    case $test_type in
	1)
	route add -net $dst_network netmask 255.255.255.0 gw $gateway dev $lhost_ifname
	;;
	2)
	ip route add ${dst_network}/24 via $gateway dev $lhost_ifname
	;;
    esac

    # Load the route with UDP traffic
    ns-udpsender -f 4 -D $dst_addr -p $DST_PORT -b -s 1472
    if [ $? -ne 0 ]; then
	tst_resm TFAIL "Failed to run a UDP datagram sender"
	return 1
    fi

    # Loop for changing the route
    cnt=0
    while [ $cnt -lt $NS_TIMES ]; do
	link_num=`expr $link_num + 1`
	if [ $link_num -ge $link_total ]; then
	    link_num=0
	fi

	pre_lhost_ifname=$lhost_ifname
	pre_gateway=$gateway

	field=`expr $link_num + 1`
	lhost_ifname=`echo $lhost_ifname_array | cut -d ' ' -f $field`
	gateway="${IPV4_NETWORK_PRE}.${link_num}.${RHOST_IPV4_HOST}"

	case $test_type in
	    1)
	    route add -net $dst_network netmask 255.255.255.0 gw $gateway dev $lhost_ifname
	    route del -net $dst_network netmask 255.255.255.0 gw $pre_gateway dev $pre_lhost_ifname
	    ;;
	    2)
	    ip route change ${dst_network}/24 via $gateway dev $lhost_ifname
	    ;;
	esac
	if [ $? -ne 0 ]; then
	    tst_resm TFAIL "Failed to change the gateway to $gateway"
	    return 1
	fi

	# Rerun if udp datagram sender is dead
	ps auxw | fgrep -v grep | grep ns-udpsender > /dev/null
	if [ $? -ne 0 ]; then
	    ns-udpsender -f 4 -D $dst_addr -p $DST_PORT -b -s 1472
	    if [ $? -ne 0 ]; then
		tst_resm TFAIL "Failed to run a UDP datagram sender"
		return 1
	    fi
	fi

	cnt=`expr $cnt + 1`
    done

    # Kill the udp datagram sender
    killall -SIGHUP ns-udpsender

    tst_resm TPASS "Test is finished correctly."
    return 0
}


#-----------------------------------------------------------------------
#
# Main
#
# Exit Value:
#   The number of the failure
#
#-----------------------------------------------------------------------

RC=0
do_setup
test_body 1 || RC=`expr $RC + 1`      # Case of route command
test_body 2 || RC=`expr $RC + 1`      # Case of ip command
do_cleanup

exit $RC
